<html>

<head>
    <style>
        .content {
                height: 0px;
    width: 0px;
    border-style: solid;
    border-width: 100px;
    border-color: red rosybrown aquamarine skyblue;
        }
 .content1{
                    height: 0px;
    width: 0px;
    border-style: solid;
    border-width: 100px;
    border-color: red transparent transparent transparent;
        }
        
    </style>
</head>

<body>
    <div class="content">
        
    </div>
    <div class="content1">
        
    </div>
</body>

</html>